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地质论评  2003 

柴达木盆地三湖地区生物气横向运聚成藏研究

Keywords: 生物气水溶气溶解度盐度水动力柴达木盆地成藏模式

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Abstract:

本文系统研究了地层水盐度对微生物菌生长发育的制约,矿化度对生物气在地层水中溶解度的影响,泥岩盖层中高矿化度地层水对封盖性能的控制作用。柴达木盆地三湖(台吉乃尔湖,涩聂湖,达布逊湖)地区主要受南缘昆仑山冰雪溶水的补给,地层水从南向北运移,北斜坡第四系地层水的矿化度最高,北斜坡泻水-汇水区高盐度条件下生物菌的活跃程度受到抑制,影响生物气大量生成并从水中游离出来,中央凹陷及其南部低矿化度条件下更适宜生物气的生成,生物气在地层水中的溶解度随矿化度的增高明显降低,南缘低矿化度水中饱含的生物气经地层水从南向北携带,在北斜坡高矿化度条件上大量游离出来,实验测试证明泥岩饱和高矿化度地层水时,其突破压力增加约100倍,封盖性能大大提高,有效地保存了北斜坡游离相生物气,研究显示生物气总体上具有向北斜坡以水溶气方式进行横向运聚的特征,展示了北斜坡气源补给充足,具有满坡含气的巨大勘探潜力。结合生物气本身的发育特征和三湖地区的水文地质条件,提出了生物所首先以水溶气方式发生远距离的横向运移以后再以游离相进行垂向运聚成藏,这一结论对下一步三湖地区生物气勘探具有直接的指导意义。

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